Good Q, hadn't thought of that. I think the back is providing most of the thrust and the hands are just to steer you, so you don't need to support the full bodyweight.
Didn't see the thruster on the back! However, their marketing claims you still have to support a little less than 50% of your body weight in forward flight.
I probably couldn't do that for the full 10 minute flight time though.
I probably couldn't do that for the full 10 minute flight time though.